Treatment of sodium salt of phenol with carbon dioxide under pressure brings about substitution of the carboxyl group, -COOH, for hydrogen of the ring. This provides a path of conversion of phenol into hydroxy carboxylic acids. The acids formed are industrially very important compounds and form many useful compounds.
Write the IUPAC name and the structure of the product formed from sodium phenoxide.

Explanation

To solve the problem, we need to follow these steps:

### Step 1: Understand the Reactants
We start with sodium phenoxide (C6H5O-Na+), which is the sodium salt of phenol. This compound will react with carbon dioxide (CO2) under pressure.

### Step 2: Identify the Reaction Mechanism
The reaction involves the substitution of a hydrogen atom on the aromatic ring of phenol with a carboxyl group (-COOH) from carbon dioxide. The sodium phenoxide has a negative charge on the oxygen, which increases the electron density on the ortho and para positions of the benzene ring, making them more reactive towards electrophiles.

...